Vent for a respiratory mask



FIG. 1 is a front perspective view of a vent for a respiratory mask showing our design;

FIG. 2 is front view thereof;

FIG. 3 is a top view thereof; and,

FIG. 4 is a right side view thereof with the left side view being a mirror image thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a vent for a respiratory mask, as shown and described. 